Coming in Quick Mail 1.3

The email could not be sent is displayed if WordPress cannot send mail for a lost password request.

Users verify their email address when they register. However, users, administrators, or anyone with access to the database, can edit it. BuddyPress sends a verification email when a user edits their address, but not WordPress.

Email Verification

Quick Mail checks the mail exchanger record on recipient domains, before sending a message. The mail exchanger record or MX, specifies the mail server that accepts messages for a domain.

It works, because there are no bug reports about being unable to send mail.

I would like to add an option to check the sender address before sending mail. A valid sender address should be a requirement.